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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f121c128db18330c3a857eec6f8b6f5f06f8e07d92dee11a011ac2b1b997d455' 
  AND token = '0vyLENXIeKk0TcrVLpnRViXxGA6Q6k8L0jjbzlDTd64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}